All jokes about Patronlock aside, this card is actually much better than people give it credit for. People comparing it to the bombers have the wrong idea. The bombers have minion stats on top of the random ping effect so they're more expensive. The fact that this costs only 3 mana is actually a big deal. Against aggro zoo decks that are flooding the meta (that demonwrath can't affect since they're mostly demons themselves) a card that can be played on turn 3 to ping some Possesed Villagers, Knife Jugglers, etc is pretty nice. Even if your opponent has 0 minions and you have 1, I'd run this over Shadow Bolt since it's 66% they hit your opponent and 33% they hit you. That's ~6 damage split amongst your opponents face/minion which can typically kill it. Now obviously bad RNG can make this card useless, but against 2-4 zoo minion boards there's a 83% it pings a 1 hp minion and acts as useful removal.

Madder Bomber does 6 damage randomly split for 1 mana. 3 mana for 9 damage randomly split doesn't really seem to be good value. just play a third of the mana for a third of the damage but only to the enemy. boom, a much better card.